Note 10 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets	$ 14,958	$ 15,501
Impaired Loans [Member]
Assets	14,958	14,968
Other Real Estate Owned [Member]
Assets		533
Fair Value, Inputs, Level 1 [Member]
Assets
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
Assets
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Assets
Fair Value, Inputs, Level 2 [Member]
Assets
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
Assets
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Assets
Fair Value, Inputs, Level 3 [Member]
Assets	14,958	15,501
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Assets	14,958	14,968
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets		$ 533